Parts of Tuscany’s main highway were closed on Tuesday (November 13), as officials feared the Tiber and other rivers could burst their banks in low-lying areas.
Central Italy has suffered from flooding for three consecutive days with attention now turning to north of Rome.
80kms north of the capital, trucks and cars were being waved off the highway as a flood alert warned the road could be swamped by water soon.
Three people died earlier on Tuesday in Tuscany after their car fell off a collapsed bridge. Their deaths brought the toll to four in flooding that has damaged many homes and stores as well as thousands of acres of farmland.
One of the worst affected areas was a zone in southern Tuscany, where flooding washed out many secondary roads, forcing hundreds of people to leave their homes, isolating several towns.